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Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Sep. 30, 2024
Other Long-Term Liabilities    
Deferred Revenue, Noncurrent $ 49 $ 48
Environmental Remediation Costs Recognized Disclosure    
Interest Rate Derivative Liabilities, at Fair Value 635 840
Operating Lease, Liability, Noncurrent 93 88
Currency swap liabilities [1] 136 116
Fair value 32 64
Environmental Exit Costs, Anticipated Cost (210) (212)
EnergyRight® financing obligation (74) (74)
Deferred Compensation Liability, Classified, Noncurrent 37 50
Other long-term liabilities 1,479 1,712
Regulatory Liability, Noncurrent 78 83
Deferred Compensation Liability, Current 33 74
Deferred Revenue, Current 27 28
Long-term project cost accruals 160 140
Operating Lease, Liability, Current 69 63
Operating Lease, Liability, Current 69 63
Commodity Contract Derivatives    
Environmental Remediation Costs Recognized Disclosure    
Fair value 6 2
Accounts payable and accrued liabilities    
Environmental Remediation Costs Recognized Disclosure    
Environmental Exit Costs, Anticipated Cost (5) (3)
EnergyRight® financing obligation (13) (13)
Customer Advances for Construction 85 60
Accounts payable and accrued liabilities | Commodity Contract Derivatives    
Environmental Remediation Costs Recognized Disclosure    
Fair value (3) (3)
Other long-term liabilities    
Environmental Remediation Costs Recognized Disclosure    
Interest Rate Derivative Liabilities, at Fair Value 589 792
Currency swap liabilities 127 109
EnergyRight® financing obligation (52) (52)
Other 98 102
Customer Advances for Construction 32 55
Other long-term liabilities | Commodity Contract Derivatives    
Environmental Remediation Costs Recognized Disclosure    
Fair value (3) (2)
Accounts Payable    
Environmental Remediation Costs Recognized Disclosure    
Long-term project cost accruals 252 124
Other long-term assets | Commodity Contract Derivatives    
Environmental Remediation Costs Recognized Disclosure    
Fair value $ 1 $ 2
[1] TVA records currency swaps net of cash collateral received from or paid to the counterparty, to the extent such amount is not recorded in Accounts payable and accrued liabilities. See Note 13 — Risk Management Activities and Derivative Transactions — Offsetting of Derivative Assets and Liabilities.